<template>
    <div>
        <!-- 顶部滑动条区域 -->
        <div id="slider" class="mui-slider">
				<div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
					<div class="mui-scroll">
						<a :class="['mui-control-item',item.id == 0 ? 'mui-active':'']" v-for="item in cates" :key="item.id" @tap="getPhotoListBycateId(item.id)">
							{{item.title}}
						</a>
						
				
					</div>
				</div>

			</div>
   
        <!-- 图片列表区域 -->
        <ul class="photo-list">
            
            <router-link :to="'/home/photoinfo/'+item.id"  v-for="item in list" :key="item.id" tag="li">
                <img v-lazy="item.img_url">
                <div class="info" >
                    <h1 class="info-title">{{item.title}}</h1>
                    <div class="info-body">{{item.zhaiyao}}</div>
                </div>
            </router-link>
            
           
            
        </ul>
    </div>
</template>


<script>
//导入mui的js文件
import mui from '../../lib/mui/js/mui.min.js'
//2初始化滑动控件
mui('.mui-scroll-wrapper').scroll({
	deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
});
export default{
    data () {
        return {
            cates:[],//所有图片分类列表的数组
            list:[] //图片列表的数组
        }
    },
    created () {
        this.getAllCategory()
        //默认进入页面就主动请求所有图片列表的数据
        this.getPhotoListBycateId(0)
    },
    mounted() {
        //当组件中的DOM结构被渲染好并放到页面中后，会执行这个钩子函数
        //如果要操作元素了，最好在mounted里面，因为这里的DOM元素是最新的
        //2初始化滑动控件
        mui('.mui-scroll-wrapper').scroll({
	        deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
        });
    },
    methods:{
        getAllCategory(){
            //获取所有的图片分类
            this.$http.get('/src/json/tupianfelei.json').then(result =>{
                if(result.body.status ===0 ){
                    //手动拼接出一个最完整的列表
                    result.body.message.unshift({title:"全部",id:0})
                    this.cates = result.body.message
                }
            })
        },
        getPhotoListBycateId(cateId){
            //根据分类id获取图片列表
            this.$http.get('/src/json/imageList.json').then(result =>{
                if(result.body.status ===0 ){
                    this.list = result.body.message
                }
            })
        }
    }
}

</script>


<style lang="scss">
*{
    touch-action:pan-y;
}

.photo-list{
    list-style: none;
    margin: 0;
    padding: 10px;
    padding-bottom: 0;
    
    img{
        width: 100%;
        vertical-align: middle;
        
    }
    li{
        box-shadow: 0 0 9px #999;
        margin-bottom: 10px;
        background-color: #cccccc;
        text-align: center;
        position: relative;
        img[lazy=loading] {
             width: 40px;
            height: 300px;
            margin: auto;
            
        }
        .info{
            position: absolute;
            bottom: 0;
            color: white;
            background-color: rgba(0, 0, 0, 0.4);
            text-align:left;
            max-height: 84px;
            .info-title{
                font-size: 14px;
            }
            .info-body{
                font-size: 13px;
            }
        }
    }
}

</style>
